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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1621563	Summit Materials Inc.	SUM	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1228680	A Ted Gardner	C/O Summit Materials, Inc. 1550 Wynkoop Street, 3Rd Floor Denver CO 80202		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class A Common Stock	Disposition	2017-03-01	19,332	$24.80	0	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	Restricted Stock Units	Acquisiton	2017-02-28	4,098	$0.00	4,098	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
4,098			No	4	A	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Class A Common Stock	6,414	Direct

Footnotes

Reflects securities held by certain investment funds affiliated with Silverhawk Summit, L.P. ("Silverhawk"). Mr. Gardner, a managing partner and co-founder of Silverhawk, may be deemed to have beneficial ownership of the securities of the Issuer held by Silverhawk.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $24.71 to $24.92, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
Each restricted stock unit represents a contingent right to receive one share of Issuer Class A common stock ("Class A Common Stock"). The restricted stock units will be settled in either Class A Common Stock or cash (or a combination thereof) at the discretion of the Issuer's compensation committee.
The restricted stock units vest on February 28, 2018.